and first lady michelle obama gave dave letterman her top ten reasons you should watch tonight. >> there will be no kiss cam. >> oh, no, no. come on. why not? >> it's got to be better than what you're watching now. joe biden says it will be a big you know what deal. >> and the number one reason to watch the democratic national convention -- >> at long last, i'll reveal who i'm voting for. >> no doubt about that. good day, i'm andrea mitchell on the final day of the democratic national convention. where tonight vice president joe biden is going to have a starring role introducing the president, placing biden's name in the nomination will be his son, beau. the attorney general of delaware and beau biden joins me now. welcome. >> great to be with you, andrea. >> great to be with you. tell me about the excitement for the biden family, joe biden's big speech tonight, the move. his anticipation. >> i'm excited to see my mom introduce my dad. i'm going to nominate him. shortly thereafter my mom will introduce my father. we're all ready for a big night, most importantly to make sure what the pre